Unknown Resistance Board.

For use with Wheatstone Bridge. Expand upon the concepts taught by the Wheatstone Bridge (615-4540). Assign each group a different "unknown", which are "disguised" so their value cannot be read. Our compact device features nine 1% resistors from 1 to 100 kiliohm, randomly mounted on a printed circuit board, any two of which can be connected in series. The resistors are wired in such a way that over 360,000values can be found. Each 1/4 watt resistor survives direct application up to 12 volts. Includes instructions.